Where are they purchasing them?

So, I run a small business where I repair & or modify gaming consoles.
I've noticed that I get people who are bring me more that 1 console to fix.
I also notice that on ebay, there are people selling BROKEN PS4s for $150-200 each, and they are selling well over 20 of these per week.
I would assume since they are selling for $150, they've got to be purchasing them for cheaper than that.
My question is, where does everyone believe they get them?
I'd like to purchase some broken PS4s for as cheap as possible, where can I buy them from???

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